Yes it is in principle, but two things have to be checked.
First if it is nominally 12 volts, it might not produce exactly 12 volts, and this needs to be tested so damage is not done to whatever is connected.
Secondly, the adaptor/charger has to be able to supply enough current (amps) for whatever you are connecting to it.
You cannot do this. If it were a 36 volt charger you could connect three 12 volt batteries in series and charge all 3 at the same time. But this is a 32 volt charger which I have never heard of.
No, a 12 volt charger will overcharge a 8 volt battery and destroy it.
A 12 volt battery charger is designed to charge 12 volt batteries.The answer to the Related Question explains how any battery charger works.
Yes, a 12 volt battery will be damaged if charged with a 24 volt charger.
If you are asking the question, can you charge a 6 volt battery with a 12 volt charger, the answer is no.
No, since in series they are 24 volts so you need to charge each one independently with the 12 volt charger. This may be done disconnected or leave them connected and put the charger on the + - of the same battery.
Charge it with a 12 volt battery charger.
No.No.
12 volt 10 amp charger is what you need.
No
NoNo
No you cannot.